<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // 1. break 是跳出分支判断的意思，如果不写就会穿透

    switch(1) {
      case 1: 
        console.log('吃饭')
        break
      case 2: // ===
        console.log('喝水')
        break
      case 3: 
        console.log('喝水22222')
        break
      default:
        console.log('打豆豆')
    }
  </script>
</body>
</html>